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<h1 id="sec_name">
<span data-if="hdevelop" style="display:inline;">uncalibrated_photometric_stereo</span><span data-if="c" style="display:none;">T_uncalibrated_photometric_stereo</span><span data-if="cpp" style="display:none;">UncalibratedPhotometricStereo</span><span data-if="dotnet" style="display:none;">UncalibratedPhotometricStereo</span><span data-if="python" style="display:none;">uncalibrated_photometric_stereo</span> (算子名称)</h1>
<h2>名称</h2>
<p><code><span data-if="hdevelop" style="display:inline;">uncalibrated_photometric_stereo</span><span data-if="c" style="display:none;">T_uncalibrated_photometric_stereo</span><span data-if="cpp" style="display:none;">UncalibratedPhotometricStereo</span><span data-if="dotnet" style="display:none;">UncalibratedPhotometricStereo</span><span data-if="python" style="display:none;">uncalibrated_photometric_stereo</span></code> — Reconstruct a surface from several, differently illuminated images.</p>
<h2 id="sec_synopsis">参数签名</h2>
<div data-if="hdevelop" style="display:inline;">
<p>
<code><b>uncalibrated_photometric_stereo</b>(<a href="#Images"><i>Images</i></a> : <a href="#NormalField"><i>NormalField</i></a>, <a href="#Gradient"><i>Gradient</i></a>, <a href="#Albedo"><i>Albedo</i></a> : <a href="#ResultType"><i>ResultType</i></a> : )</code></p>
</div>
<div data-if="c" style="display:none;">
<p>
<code>Herror <b>T_uncalibrated_photometric_stereo</b>(const Hobject <a href="#Images"><i>Images</i></a>, Hobject* <a href="#NormalField"><i>NormalField</i></a>, Hobject* <a href="#Gradient"><i>Gradient</i></a>, Hobject* <a href="#Albedo"><i>Albedo</i></a>, const Htuple <a href="#ResultType"><i>ResultType</i></a>)</code></p>
</div>
<div data-if="cpp" style="display:none;">
<p>
<code>void <b>UncalibratedPhotometricStereo</b>(const HObject&amp; <a href="#Images"><i>Images</i></a>, HObject* <a href="#NormalField"><i>NormalField</i></a>, HObject* <a href="#Gradient"><i>Gradient</i></a>, HObject* <a href="#Albedo"><i>Albedo</i></a>, const HTuple&amp; <a href="#ResultType"><i>ResultType</i></a>)</code></p>
<p>
<code><a href="HImage.html">HImage</a> <a href="HImage.html">HImage</a>::<b>UncalibratedPhotometricStereo</b>(HImage* <a href="#Gradient"><i>Gradient</i></a>, HImage* <a href="#Albedo"><i>Albedo</i></a>, const HTuple&amp; <a href="#ResultType"><i>ResultType</i></a>) const</code></p>
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<p>
<code>static void <a href="HOperatorSet.html">HOperatorSet</a>.<b>UncalibratedPhotometricStereo</b>(<a href="HObject.html">HObject</a> <a href="#Images"><i>images</i></a>, out <a href="HObject.html">HObject</a> <a href="#NormalField"><i>normalField</i></a>, out <a href="HObject.html">HObject</a> <a href="#Gradient"><i>gradient</i></a>, out <a href="HObject.html">HObject</a> <a href="#Albedo"><i>albedo</i></a>, <a href="HTuple.html">HTuple</a> <a href="#ResultType"><i>resultType</i></a>)</code></p>
<p>
<code><a href="HImage.html">HImage</a> <a href="HImage.html">HImage</a>.<b>UncalibratedPhotometricStereo</b>(out <a href="HImage.html">HImage</a> <a href="#Gradient"><i>gradient</i></a>, out <a href="HImage.html">HImage</a> <a href="#Albedo"><i>albedo</i></a>, <a href="HTuple.html">HTuple</a> <a href="#ResultType"><i>resultType</i></a>)</code></p>
</div>
<div data-if="python" style="display:none;">
<p>
<code>def <b>uncalibrated_photometric_stereo</b>(<a href="#Images"><i>images</i></a>: HObject, <a href="#ResultType"><i>result_type</i></a>: Sequence[str]) -&gt; Tuple[HObject, HObject, HObject]</code></p>
</div>
<h2 id="sec_description">描述</h2>
<p><code><span data-if="hdevelop" style="display:inline">uncalibrated_photometric_stereo</span><span data-if="c" style="display:none">uncalibrated_photometric_stereo</span><span data-if="cpp" style="display:none">UncalibratedPhotometricStereo</span><span data-if="com" style="display:none">UncalibratedPhotometricStereo</span><span data-if="dotnet" style="display:none">UncalibratedPhotometricStereo</span><span data-if="python" style="display:none">uncalibrated_photometric_stereo</span></code> can be used to extract high-frequency
surface details from a given object with no prior knowledge about the
illumination, geometry and reflectance of the object. The geometry of
interest can be for example dents, folds or scratches. 该算子 can
usually not be used for measuring the overall shape of an object.
该算子 returns the normals <a href="#NormalField"><i><code><span data-if="hdevelop" style="display:inline">NormalField</span><span data-if="c" style="display:none">NormalField</span><span data-if="cpp" style="display:none">NormalField</span><span data-if="com" style="display:none">NormalField</span><span data-if="dotnet" style="display:none">normalField</span><span data-if="python" style="display:none">normal_field</span></code></i></a> of the surface as
a 3-channel image with each image encoding a component of the normal.
This is used as a visualization of the result as a color coded image.
Further, it returns the <a href="#Gradient"><i><code><span data-if="hdevelop" style="display:inline">Gradient</span><span data-if="c" style="display:none">Gradient</span><span data-if="cpp" style="display:none">Gradient</span><span data-if="com" style="display:none">Gradient</span><span data-if="dotnet" style="display:none">gradient</span><span data-if="python" style="display:none">gradient</span></code></i></a> and the <a href="#Albedo"><i><code><span data-if="hdevelop" style="display:inline">Albedo</span><span data-if="c" style="display:none">Albedo</span><span data-if="cpp" style="display:none">Albedo</span><span data-if="com" style="display:none">Albedo</span><span data-if="dotnet" style="display:none">albedo</span><span data-if="python" style="display:none">albedo</span></code></i></a> of the
surface. Which result should be calculated can be controlled with
<a href="#ResultType"><i><code><span data-if="hdevelop" style="display:inline">ResultType</span><span data-if="c" style="display:none">ResultType</span><span data-if="cpp" style="display:none">ResultType</span><span data-if="com" style="display:none">ResultType</span><span data-if="dotnet" style="display:none">resultType</span><span data-if="python" style="display:none">result_type</span></code></i></a>.
This operator is related to <a href="photometric_stereo.html"><code><span data-if="hdevelop" style="display:inline">photometric_stereo</span><span data-if="c" style="display:none">photometric_stereo</span><span data-if="cpp" style="display:none">PhotometricStereo</span><span data-if="com" style="display:none">PhotometricStereo</span><span data-if="dotnet" style="display:none">PhotometricStereo</span><span data-if="python" style="display:none">photometric_stereo</span></code></a>, but does not
require known (i.e. previously calibrated) light directions. Note that
<a href="photometric_stereo.html"><code><span data-if="hdevelop" style="display:inline">photometric_stereo</span><span data-if="c" style="display:none">photometric_stereo</span><span data-if="cpp" style="display:none">PhotometricStereo</span><span data-if="com" style="display:none">PhotometricStereo</span><span data-if="dotnet" style="display:none">PhotometricStereo</span><span data-if="python" style="display:none">photometric_stereo</span></code></a> is faster and more accurate, but needs the
light direction information.
For sensible results an orthographic projection of the
camera is assumed for both the calibrated and uncalibrated case.
This is typically reached by using a telecentric lens or at least a lens
with a long focal distance.
</p>
<p>该算子 requires at least three images of the same object, taken with a
static, non-moving camera and different lighting directions for each image.
For best results, the object should exhibit Lambertian reflection properties,
no inter-reflection or shadow castings.</p>
<h2 id="sec_execution">运行信息</h2>
<ul>
  <li>多线程类型:可重入(与非独占操作符并行运行)。</li>
<li>多线程作用域:全局(可以从任何线程调用)。</li>
  
    <li>Automatically parallelized on internal data level.</li>
  
</ul>
<h2 id="sec_parameters">参数表</h2>
  <div class="par">
<div class="parhead">
<span id="Images" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Images</span><span data-if="c" style="display:none">Images</span><span data-if="cpp" style="display:none">Images</span><span data-if="com" style="display:none">Images</span><span data-if="dotnet" style="display:none">images</span><span data-if="python" style="display:none">images</span></code></b> (input_object)  </span><span>singlechannelimage(-array) <code>→</code> <span data-if="hdevelop" style="display:inline">object</span><span data-if="dotnet" style="display:none"><a href="HImage.html">HImage</a></span><span data-if="python" style="display:none">HObject</span><span data-if="cpp" style="display:none"><a href="HImage.html">HImage</a></span><span data-if="c" style="display:none">Hobject</span> (byte / uint2)</span>
</div>
<p class="pardesc">The input images with different illumination.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="NormalField" class="parname"><b><code><span data-if="hdevelop" style="display:inline">NormalField</span><span data-if="c" style="display:none">NormalField</span><span data-if="cpp" style="display:none">NormalField</span><span data-if="com" style="display:none">NormalField</span><span data-if="dotnet" style="display:none">normalField</span><span data-if="python" style="display:none">normal_field</span></code></b> (output_object)  </span><span>image(-array) <code>→</code> <span data-if="hdevelop" style="display:inline">object</span><span data-if="dotnet" style="display:none"><a href="HImage.html">HImage</a></span><span data-if="python" style="display:none">HObject</span><span data-if="cpp" style="display:none"><a href="HImage.html">HImage</a></span><span data-if="c" style="display:none">Hobject *</span> (real)</span>
</div>
<p class="pardesc">The normal field of the surface.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="Gradient" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Gradient</span><span data-if="c" style="display:none">Gradient</span><span data-if="cpp" style="display:none">Gradient</span><span data-if="com" style="display:none">Gradient</span><span data-if="dotnet" style="display:none">gradient</span><span data-if="python" style="display:none">gradient</span></code></b> (output_object)  </span><span>image <code>→</code> <span data-if="hdevelop" style="display:inline">object</span><span data-if="dotnet" style="display:none"><a href="HImage.html">HImage</a></span><span data-if="python" style="display:none">HObject</span><span data-if="cpp" style="display:none"><a href="HImage.html">HImage</a></span><span data-if="c" style="display:none">Hobject *</span> (vector_field)</span>
</div>
<p class="pardesc">The gradient field of the surface .</p>
</div>
  <div class="par">
<div class="parhead">
<span id="Albedo" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Albedo</span><span data-if="c" style="display:none">Albedo</span><span data-if="cpp" style="display:none">Albedo</span><span data-if="com" style="display:none">Albedo</span><span data-if="dotnet" style="display:none">albedo</span><span data-if="python" style="display:none">albedo</span></code></b> (output_object)  </span><span>image <code>→</code> <span data-if="hdevelop" style="display:inline">object</span><span data-if="dotnet" style="display:none"><a href="HImage.html">HImage</a></span><span data-if="python" style="display:none">HObject</span><span data-if="cpp" style="display:none"><a href="HImage.html">HImage</a></span><span data-if="c" style="display:none">Hobject *</span> (real)</span>
</div>
<p class="pardesc">The albedo of the surface.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="ResultType" class="parname"><b><code><span data-if="hdevelop" style="display:inline">ResultType</span><span data-if="c" style="display:none">ResultType</span><span data-if="cpp" style="display:none">ResultType</span><span data-if="com" style="display:none">ResultType</span><span data-if="dotnet" style="display:none">resultType</span><span data-if="python" style="display:none">result_type</span></code></b> (input_control)  </span><span>string-array <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">Sequence[str]</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (string)</span><span data-if="dotnet" style="display:none"> (<i>string</i>)</span><span data-if="cpp" style="display:none"> (<i>HString</i>)</span><span data-if="c" style="display:none"> (<i>char*</i>)</span></span>
</div>
<p class="pardesc">The result type.</p>
<p class="pardesc"><span class="parcat">Default:
      </span>
    <span data-if="hdevelop" style="display:inline">'all'</span>
    <span data-if="c" style="display:none">"all"</span>
    <span data-if="cpp" style="display:none">"all"</span>
    <span data-if="com" style="display:none">"all"</span>
    <span data-if="dotnet" style="display:none">"all"</span>
    <span data-if="python" style="display:none">"all"</span>
</p>
<p class="pardesc"><span class="parcat">List of values:
      </span>[], <span data-if="hdevelop" style="display:inline">'albedo'</span><span data-if="c" style="display:none">"albedo"</span><span data-if="cpp" style="display:none">"albedo"</span><span data-if="com" style="display:none">"albedo"</span><span data-if="dotnet" style="display:none">"albedo"</span><span data-if="python" style="display:none">"albedo"</span>, <span data-if="hdevelop" style="display:inline">'all'</span><span data-if="c" style="display:none">"all"</span><span data-if="cpp" style="display:none">"all"</span><span data-if="com" style="display:none">"all"</span><span data-if="dotnet" style="display:none">"all"</span><span data-if="python" style="display:none">"all"</span>, <span data-if="hdevelop" style="display:inline">'gradient'</span><span data-if="c" style="display:none">"gradient"</span><span data-if="cpp" style="display:none">"gradient"</span><span data-if="com" style="display:none">"gradient"</span><span data-if="dotnet" style="display:none">"gradient"</span><span data-if="python" style="display:none">"gradient"</span>, <span data-if="hdevelop" style="display:inline">'normal_field'</span><span data-if="c" style="display:none">"normal_field"</span><span data-if="cpp" style="display:none">"normal_field"</span><span data-if="com" style="display:none">"normal_field"</span><span data-if="dotnet" style="display:none">"normal_field"</span><span data-if="python" style="display:none">"normal_field"</span>, <span data-if="hdevelop" style="display:inline">'normalized_gradient'</span><span data-if="c" style="display:none">"normalized_gradient"</span><span data-if="cpp" style="display:none">"normalized_gradient"</span><span data-if="com" style="display:none">"normalized_gradient"</span><span data-if="dotnet" style="display:none">"normalized_gradient"</span><span data-if="python" style="display:none">"normalized_gradient"</span></p>
</div>
<h2 id="sec_example_all">例程 (HDevelop)</h2>
<pre class="example">
* read severally illuminated images
FName := 'photometric_stereo/pharma_braille_0' + [1:4] + '.png'
read_image(Images, FName)
* extract surface normals, gradients and albedo from images
uncalibrated_photometric_stereo(Images, NormalField, Gradient, Albedo, 'all')
derivate_vector_field (Gradient, Result, 0.1, 'mean_curvature')
reconstruct_height_field_from_gradient (Gradient, HeightField, 'poisson', \
                                        [], [])
</pre>
<h2 id="sec_result">结果</h2>
<p>该算子 <code><span data-if="hdevelop" style="display:inline">uncalibrated_photometric_stereo</span><span data-if="c" style="display:none">uncalibrated_photometric_stereo</span><span data-if="cpp" style="display:none">UncalibratedPhotometricStereo</span><span data-if="com" style="display:none">UncalibratedPhotometricStereo</span><span data-if="dotnet" style="display:none">UncalibratedPhotometricStereo</span><span data-if="python" style="display:none">uncalibrated_photometric_stereo</span></code> returns the
<a href="#NormalField"><i><code><span data-if="hdevelop" style="display:inline">NormalField</span><span data-if="c" style="display:none">NormalField</span><span data-if="cpp" style="display:none">NormalField</span><span data-if="com" style="display:none">NormalField</span><span data-if="dotnet" style="display:none">normalField</span><span data-if="python" style="display:none">normal_field</span></code></i></a> for the given images as well as the appropriate
gradients for each pixel and the <a href="#Albedo"><i><code><span data-if="hdevelop" style="display:inline">Albedo</span><span data-if="c" style="display:none">Albedo</span><span data-if="cpp" style="display:none">Albedo</span><span data-if="com" style="display:none">Albedo</span><span data-if="dotnet" style="display:none">albedo</span><span data-if="python" style="display:none">albedo</span></code></i></a> of the object.
</p>
<h2 id="sec_alternatives">可替代算子</h2>
<p>
<code><a href="photometric_stereo.html"><span data-if="hdevelop" style="display:inline">photometric_stereo</span><span data-if="c" style="display:none">photometric_stereo</span><span data-if="cpp" style="display:none">PhotometricStereo</span><span data-if="com" style="display:none">PhotometricStereo</span><span data-if="dotnet" style="display:none">PhotometricStereo</span><span data-if="python" style="display:none">photometric_stereo</span></a></code>
</p>
<h2 id="sec_see">参考其它</h2>
<p>
<code><a href="photometric_stereo.html"><span data-if="hdevelop" style="display:inline">photometric_stereo</span><span data-if="c" style="display:none">photometric_stereo</span><span data-if="cpp" style="display:none">PhotometricStereo</span><span data-if="com" style="display:none">PhotometricStereo</span><span data-if="dotnet" style="display:none">PhotometricStereo</span><span data-if="python" style="display:none">photometric_stereo</span></a></code>
</p>
<h2 id="sec_references">References</h2>
<p>

H. Hayakawa: “Photometric stereo under a light source with arbitrary motion”.
Journal Optical Society America,
Vol. 11, No. 11/November 1994.
</p>
<h2 id="sec_module">模块</h2>
<p>
3D Metrology</p>
<!--OP_REF_FOOTER_START-->
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